Why does the car wheel make an unusual noise?

Abnormal noises from car wheels may be caused by a variety of reasons, including but not limited to:

Tire problems: small stones or nails stuck in the gaps of tires, foreign objects sticking to the surface of tires, aging tires or excessive or low tire pressure, etc., may cause abnormal noises. 
Brake system problems: brake pads that are worn too thin or brake discs that are rusted may cause metal friction sounds. 34
Bearing problems: Damaged or worn wheel bearings may produce buzzing sounds, especially when the vehicle speed increases. 23
Suspension and shock absorption problems: front shock absorber failure or loose rubber components of the suspension system may cause abnormal noises. 89
Other factors: abnormal noises may also be caused by tires that are not dynamically balanced or screws that are not tightened. 67
It is recommended to judge the possible causes based on the specific manifestations of the abnormal noise (such as sound type, frequency of occurrence, etc.), and go to a professional auto repair shop for inspection and repair in a timely manner.